124142406221 has 4 divisors (see below), whose sum is σ = 124143251100. Its totient is φ = 124141561344.

The previous prime is 124142406209. The next prime is 124142406251. The reversal of 124142406221 is 122604241421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122604241421 = 148949 ⋅823129.

It can be written as a sum of positive squares in 2 ways, for example, as 102951781321 + 21190624900 = 320861^2 + 145570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124142406221 is a prime.

It is a super-2 number, since 2×124142406221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124142406251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138356 + ... + 517133.

It is an arithmetic number, because the mean of its divisors is an integer number (31035812775).

Almost surely, 2^124142406221 is an apocalyptic number.

It is an amenable number.

124142406221 is a deficient number, since it is larger than the sum of its proper divisors (844879).

124142406221 is an equidigital number, since it uses as much as digits as its factorization.

124142406221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844878.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 124142406221 its reverse (122604241421), we get a palindrome (246746647642).

The spelling of 124142406221 in words is "one hundred twenty-four billion, one hundred forty-two million, four hundred six thousand, two hundred twenty-one".